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134858Re: how to execute ranger from gvim

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  • ping
    Dec 4, 2012
      On 12/04/2012 01:19 AM, Gary Johnson wrote:
      > On 2012-12-03, ping wrote:
      >> On 12/3/2012 8:06 PM, Gary Johnson wrote:
      >>> exe 'edit' readfile(tmpfile)[0]
      >>>>> " edit the file whose name
      >>>>> " is in the first line of
      >>>>> " tmpfile. (readfile()
      >>>>> " returns the contents of the
      >>>>> " file as a list of lines.
      >>>>> " List element 0 is the
      >>>>> " first line.
      >> thanks for the line by line annotation, now I understand!
      >> just one last small thing, in the above line, won't it suffice just:
      >> exe readfile(tmpfile)
      >> ?
      > I'm not sure what you are expecting that command to do. The :exe
      > command executes its argument string, so its argument string must be
      > an executable Vim command. The readline() function returns a list
      > (which is not a string), and the first element of that list will in
      > this case be a file name. A file name is not an executable Vim
      > command.
      >> my test shows that will only give me a line of the file name, but now
      >> the file contents so you are right,
      >> but help says:
      >> readfile({fname} [, {binary} [, {max}]])
      >> Read file {fname} and return a List, each line of the file
      >> as an item. Lines broken at NL characters. Macintosh files
      >> separated with CR will result in a single long line
      >> (unless a
      >> NL appears somewhere).
      >> so readfile should have "read" the "file", why I only get the
      >> filename instead?
      > The readfile() function read the file whose name was the value of
      > the tmpfile variable. That file contained the name of the file you
      > selected in ranger.
      > Maybe an example would be clearer.
      > Let's say you execute :RangerChooser in an unnamed buffer. The
      > tempname() function returns the name of a temporary file, something
      > like /tmp/vuZJYgI/2, so ranger is executed with arguments like this:
      > ranger --choosefile=/tmp/vuZJYgI/2 .
      > You browse your home directory and select a file named hello.txt.
      > Ranger saves the string "/home/ping/hello.txt" into the file
      > /tmp/vuZJYgI/2 and exits. Vim now executes
      > readfile("/tmp/vuZJYgI/2") which returns the list
      > ['/home/ping/hello.txt']
      > The zeroth element of that list, specified in the function as
      > readfile(tmpfile)[0]
      > is the string '/home/ping/hello.txt'. The command
      > exe 'edit' readfile(tmpfile)[0]
      > evaluates to
      > edit '/home/ping/hello.txt'
      > which is the desired result.
      > Regards,
      > Gary
      that is super clear !(I also got it this morning on my way driving to
      work :D )
      good learning for me, thanks for all the explanations.

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